Discover, Develop, Operate


  • open pit copper/gold mine
  • mill processes approx. 16,800 tonnes per day
  • commenced operations 1997
  • current mine life to 2026
  • concentrate trucked to Port of Vancouver
  • mine operations suspended Aug 4, 2014 due to TSF breach
  • modified mine operations restarted Aug 5, 2015
  • mine received authorizations on June 23, 2016 to return to normal operations
  • approval of long-term water management plan received April 7, 2017

Mount Polley is an open pit copper/gold mine with an underground component located in south-central British Columbia, 56 kilometres northeast of Williams Lake. The property encompasses 20,113 hectares, comprised of seven mining leases totalling 2,007 hectares, and 46 mineral claims encompassing 18,106 hectares. Mount Polley mine is owned and operated by Mount Polley Mining Corporation (MPMC), a subsidiary of Imperial.

The Mount Polley mine resumed normal operations in June 2016, following receipt of authorizations from the Ministry of Energy and Mines (MEM) and the Ministry of Environment (MOE). To date, significant progress has been made with our remediation of the areas impacted by the 2014 Mount Polley Breach. Research and monitoring has observed rapid recovery of the impacted environment. Remediation and monitoring of these areas is ongoing.

MPMC had been operating under a short-term water management plan in effect since November 30, 2015. In October 2016, MPMC submitted its long-term water management plan permit amendment application to MOE. Formal approval of the long-term water management plan received by MPMC on April 7, 2017, following five months of extensive public consultation with First Nations and local communities. The application also underwent a full technical review from the Cariboo Mine Development Review Committee which includes representatives from provincial and federal agencies, First Nations, local governments (City of Williams Lake and Cariboo Regional District), and the community of Likely.


On January 7, 2019, the Company announced Mount Polley mine operations would be suspended due to declining copper prices. Milling of low grade stockpiles are targeted to extend operations to the end of May 2019. Annual metal production for 2019, through to suspension of operations, is targeted in the range of 4-5 million pounds copper and 13-14 thousand ounces gold. The Company anticipates a resumption of operations once the economics of mining at Mount Polley improve. There will be no impact to the ongoing environmental monitoring and remediation program.

Annual Production

Years Ended 2018 2017 2016
Copper - 000’s pounds 14,973 19,071 25,339
Gold - ounces 37,120 48,009 46,444

Refer to the Company’s New Releases, Quarter Reports & Annual Information Form for additional information.

Update Feb | 2019